Circuit. UC1543 Datasheet

UC1543 Datasheet PDF


Part

UC1543

Description

Power Supply Supervisory Circuit

Manufacture

etcTI

Page 20 Pages
Datasheet
Download UC1543 Datasheet


UC1543 Datasheet
www.ti.com
UC1543, UC1544
UC2543, UC2544
UC3543, UC3544
SLUS188A – APRIL 1997 – REVISED FEBRUARY 2007
Power Supply Supervisory Circuit
FEATURES
Includes Over-Voltage, Under-Voltage, and
Current Sensing Circuits
Internal 1% Accurate Reference
Programmable Time Delays
SCR “Crowbar” Drive of 300 mA
Remote Activation Capability
Optional Over-Voltage Latch
Uncommitted Comparator Inputs for Low
Voltage Sensing (UC1544 Series Only)
DESCRIPTION
The monolithic integrated circuits contain all the
functions necessary to monitor and control the output
of a sophisticated power supply system.
Over-voltage (O.V.) sensing with provision to trigger
an external SCR “crowbar” shutdown; an
undervoltage (U.V.) circuit which can be used to
monitor either the output or to sample the input line
voltage; and a third op amp/comparator usable for
current sensing (C.L.) are all included in this device,
together with an independent, accurate reference
generator.
Both over- and under-voltage sensing circuits can be
externally programmed for minimum time duration of
fault before triggering. All functions contain open
collector outputs which can be used independently or
wire-or’ed together, and although the SCR trigger is
directly connected only to the over-voltage sensing
circuit, it may be optionally activated by any of the
other outputs, or from an external signal. The O.V.
circuit also includes an optional latch and external
reset capability.
The UC1544/2544/3544 devices have the added
versatility of completely uncommitted inputs to the
voltage sensing comparators so that levels less than
2.5 V may be monitored by dividing down the internal
reference voltage. The current sense circuit may be
used with external compensation as a linear amplifier
or as a highgain comparator. Although nominally set
for zero input offset, a fixed threshold may be added
with an external resistor. Instead of current limiting,
this circuit may also be used as an additional voltage
monitor.
The reference generator circuit is internally trimmed
to eliminate the need for external potentiometers and
the entire circuit may be powered directly from either
the output being monitored or from a separate bias
voltage.
BLOCK DIAGRAM
NOTE:
For each terminal, first number refers to 1543 series, second to 1544 series.
*On 1543 series, this function is internally connected to VREF.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1997–2007, Texas Instruments Incorporated

UC1543 Datasheet
UC1543, UC1544
UC2543, UC2544
UC3543, UC3544
SLUS188A – APRIL 1997 – REVISED FEBRUARY 2007
www.ti.com
Connection Diagrams
DIL-16, SOIC-16 (TOP VIEW)
J or N, DW Package
(Also W Package for the UC1543 Only)
UC 1543
UC 2543
UC 3543
SCR Trigger 1
Remote Activate 2
Reset 3
O.V. Indicate 4
O.V. Delay 5
O.V. Input 6
U.V. Input 7
U.V. Delay 8
16 VIN
15 VREF
14 Ground
13 C.L. Output
12 Offset/Comp
11 C.L. N.I. Input
10 C.L. INV. Input
9 U.V. Indicate
DIL-18, SOIC-18 (TOP VIEW)
J or N, DW Package
SCR Trigger 1
Remote Activate 2
Reset 3
O.V. Indicate 4
O.V. Delay 5
O.V. N.I. Input 6
O.V. Inv. Input 7
U.V. N.I. Input 8
U.V. Inv. Input 9
18 VIN
UC 1544
UC 2544
UC 3544
17 VREF
16 Ground
15 C.L. Output
14 Offset/Comp
13 C.L. N.I. Input
12 C.L. INV. Input
11 U.V. Indicate
10 U.V. Delay
PLCC-20, LCC-20
(TOP VIEW)
Q or L Package
3 2 1 20 19
4 18
5 17
6 16
7 15
8 14
9 10 11 12 13
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C 1
SCR Trigger
2
Remote Activate
3
Reset
4
O.V. Indicate
5
N/C 6
O.V. Delay
7
O.V. Input
8
N/C 9
N/C 10
U.V. Input
11
U.V. Delay
12
U.V. Indicate
13
C.L. INV. Input
14
C.L. N.I. Input
15
Offset/Comp
16
C.L. Output
17
Ground
18
VREF
19
VIN 20
PLCC-20, LCC-20
(TOP VIEW)
Q or L Package
3 2 1 20 19
4 18
5 17
6 16
7 15
8 14
9 10 11 12 13
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C 1
SCR Trigger
2
Remote Activate
3
Reset
4
O.V. Indicate
5
N/C 6
O.V. Delay
7
O.V. N.I. Input
O.V. INV. Input
U.V. N.I. Input
8
9
10
U.V. INV. Input
11
U.V. Delay
12
U.V. Indicate
13
C.L. INV. Input
14
C.L. N.I. Input
15
Offset/Comp
16
C.L. Output
17
Ground
18
VREF
19
VIN 20
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
VIN Input supply voltage
Sense inputs, voltage range
SCR trigger current (2)
Indicator output voltage
Indicator output sink current
Power dissipation (package limitation)
UC1543, UC1544
TJ Operating temperature range
UC2543, UC2544
UC3543, UC3544
Tstg Storage temperature range
(1) Currents are positive-into, negative-out of the specified terminal.
(2) At higher input voltages, a dissipation limiting resistor, RG, is required.
2 Submit Documentation Feedback
VALUE
40
0 to VIN
-600
40
50
1000
-55 to 125
-25 to 85
0 to 70
-65 to 150
UNIT
V
mA
V
mA
mW
°C


Features Datasheet pdf www.ti.com UC1543, UC1544 UC2543, UC254 4 UC3543, UC3544 SLUS188A – APRIL 199 7 – REVISED FEBRUARY 2007 Power Suppl y Supervisory Circuit FEATURES • Inc ludes Over-Voltage, Under-Voltage, and Current Sensing Circuits • Internal 1 % Accurate Reference • Programmable T ime Delays • SCR “Crowbar” Drive of 300 mA • Remote Activation Capabil ity • Optional Over-Voltage Latch • Uncommitted Comparator Inputs for Low Voltage Sensing (UC1544 Series Only) DE SCRIPTION The monolithic integrated cir cuits contain all the functions necessa ry to monitor and control the output of a sophisticated power supply system. O ver-voltage (O.V.) sensing with provisi on to trigger an external SCR “crowba r” shutdown; an undervoltage (U.V.) c ircuit which can be used to monitor eit her the output or to sample the input l ine voltage; and a third op amp/compara tor usable for current sensing (C.L.) a re all included in this device, togethe r with an independent, accurate reference generator. Both over- and under-voltage sensin.
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